﻿// Jinx AJAX Framework
// Copyright (C) 2008 Blake Hegerle
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Jinx.Controllers;

namespace Jinx.Communications.Applications.Services
{
    public class OperationInvocation
    {
        public static object Invoke(string Method, object On, string JsonArgument)
        {
            var MethodMatch = On.FindOperation(Method);

            var Parameters = from Param in MethodMatch.GetParameters()
                             select new KeyValuePair<string, Type>(Param.Name, Param.ParameterType);

            object[] Argument;
            try
            {
                Argument = Deserializer.Map(JsonArgument, Parameters);
            }
            catch (Exception e)
            {
                throw new OperationCouldNotBeInvoked(Method,
                                                     "the argument object could not be deserialized from its JSON string",
                                                     e);
            }

            try
            {
                return MethodMatch.Invoke(On, Argument);
            }
            catch (TargetInvocationException e)
            {
                throw e.InnerException;
            }
        }
    }
}